In an unexpected announcement today, T-Mobile’s CEO, Phillip Humm, has resigned from his position. Jim Alling, the current T-Mobile COO, will now take over as the CEO as a temporary measure until another CEO can be found for the job.

The changes are effective immediately and it appears Humm is going to try and look for a new job outside of Deutsche Telekom, the parent company of T-Mobile USA. In addition, Humm will join his family in Europe as he changes careers.

Alling recently emailed all T-Mobile employees about the change in leadership at the company and he reiterates T-Mobile’s commitment to improving network infrastructure, building its brand, and increasing revenue. The letter can be read at the link below.

We wish Humm best of luck in his future endeavors and I’m sure Alling will do a tremendous job filling in for Humm.